quiz 6

Question 1

list two of the three muscles that are primary muscles of ejaculation

Answer 1

urethralis

bulbospongiosus

Question 2

which two species have lower losses of spermatozoa from the female repro tract because semen is ejaculated in fractions - one gel fraction

Answer 2

boar

stallion

Question 3

seminal plasma adds various proteins ad CHOs which must be removed in t he female repro tract. This process is called capacitation

a. where does capacitation begin
b. where does it end
c. is it reversible

Answer 3

a. begins as ascends the cervix/uterus
b. ends in the isthmus
c. it is reversible

Question 4

what are the two ways in which sperm are lost when they are in the female repro tract

Answer 4

retrograde loss

phagocytosis

Question 5

list the eight post capacitation events

Answer 5

1. hyperactive motility
2. binds to zona pelluicida
3. acrosomal reaction
4. penetrates zp
5. fusion of oocyte- sperm membrane
6. sperm is engulfed
7. 8

Question 6

there are four barriers sperm must fight through in order to make it through the female repro tract

Answer 6

vaginal bacteria and pH
cervical mucus (sulfomucin)
utertubular junction
leukocytes

Question 7

what is polyspermy and why do we want to prevent this occurence

Answer 7

polyspermy is when more than one sperm enter oocyte. we want to prevent it because it makes the zygote inviable due to too much sematic material

Question 8

list 3 factors which can occur leading to a decreased ability of the ova to block polyspermy

Answer 8

heating of ova
age of ova
excess sperm numbers

Question 9

in the female estradiol effects on target tissues results in increased myometrial contractions. What hormone found in male seminal fluid produces similar results

Answer 9

PGF2a

Question 10

please name the hormone which influences a sperms movement from the head of the epidid to the vas def

Answer 10

oxytocin